The best way is actually to do the modelling based on the actual particular activity. What we have seen, and I've talked to people who do this, is that it is actually really tricky to go to one site and say that this is how much we've lost or how much we've improved. What I would tell you from my experience is that when we look at tributaries right now within the St. Lawrence that, given the soil characteristics and given the type of land use characteristics are at 100%, when you compare those to similar tributaries for which best management practices are used, they are down in the 50% to 60% range. That gives you an idea that there is about a 40% improvement. We actually use that approach to set the delisting targets.
On March 27th, 2014. See this statement in context.